—ZigBee has attracted attention for constructing the sensor network such as home energy management system. Both ZigBee and wireless LAN (WLAN) use a 2.4GHz band, called the industrial, scientific, and medical unlicensed band; therefore, ZigBee faces severe interference problems in the presence of WLAN. Frame collisions are serious problems between ZigBee and WLAN. Both employ a carrier sense m...

Für die Nutzung mobiler Endgeräte in Hörsälen und Seminarräumen ist eine gut ausgebaute WLAN-Infrastruktur eine unverzichtbare Voraussetzung. Bereits 2010 wurde an der Westfälischen Wilhelms-Universität Münster (WWU) in den genannten Räumlichkeiten eine lückenlose WLAN-Grundversorgung realisiert. Die zunehmende Verbreitung mobiler Endgeräte und die Möglichkeit der systematischen Nutzung im Rahm...

The opportunity for 802.11b WLAN technology is spreading; both in the business and consumer sectors. Journalistic genre in this embryonic area assert that people use WLAN because it liberates them from wires, which enables complete mobility to use WLAN in any location with 802.11b. This study addresses both business and personal sectors, and quantifies where and which specific tasks people enga...

A new multi-layer substrate integrated waveguide (SIW) structure is developed to design dual-band evanescent-mode band-pass filters (BPFs). Two independent series LC circuits are implemented by incorporating metallic irises in the different layers of the structure. The combination of the metallic irises with capacitive-plates is embedded inside the SIW to independently excite two evane...

This paper presents network traffic measurements from a campus-wide wireless LAN (WLAN), with the data collected using remote passive wireless-side measurement. We used commercially-available monitoring devices to collect wireless traffic concurrently from 9 selected locations on the campus WLAN for 6 weeks. The aggregate trace contains almost 1 billion wireless frames, representing the WLAN ac...

As all can see that the demand of WLAN is increasing gradually, so here it is necessary to improve the performance of WLAN. There are many parameters which can directly affect the performance of WLAN like data rate, modulation scheme, buffer size, RTS threshold etc. One of them is fragmentation threshold. In this paper we are rising up the performance of WLAN by moderating the value of fragment...

An important issue in the widespread deployment of infrastructure based wireless local area networks (WLANs) is the network design. In this paper, we propose a new WLAN design approach that focuses on assuring sufficient data rate capacity to meet expected user demand in the coverage area, while still satisfying signal coverage and interference level requirements. Noting the low cost of WLAN ac...

Voice IP (VoIP) over wireless local area network (WLAN) is a topic of great interest in the research arena. To investigate what are the performance limitations in establishing VoIP calls over WLAN networks we performed some simulations. We show in this paper these simulation results in ad-hoc and infrastructure WLAN networks, working under ideal and real conditions. Measures and graphs of packe...

In recent years, wireless LAN (WLAN) has gained popularity in a variety of locations. This has lead to development of high level security protocols for WLAN. The newest protocol IEEE 802.11i ratified to provide strong data encryption but it can not prevent Denial of Service (DoS) attacks on WLAN. This paper in a testbed, conducts an experimental framework to implement and quantify common types ...

First generation Wireless LAN (WLAN) systems were all about basic standards, connectivity, and end-user benefits. They did not address a number of key enterprise requirements. Second generation WLAN systems are all about enhanced standards addressing security, Quality of Service (QoS), interoperability, enterprise-wide roaming, and architected solutions with placement of functionality for optim...